Brierley, who will be added to the NSW's child protection register, pleaded guilty to three counts of possessing child abuse material on April 1 after images were found on his digital devices.

Those pleas led NZ Prime Minister Jacinda Arden to immediately ask the local honours unit to consider stripping Brierley of his knighthood.

The Sydney District Court on Friday was told that most of the facts of his crimes are agreed but a few, narrow issues remain disputed.

But that will likely resolve before another sentence mention on May 21, the 83-year-old multi-millionaire's barrister Lisa-Claire Hutchinson said.

Brierley, who resides in Sydney's exclusive Point Piper, appeared in court via AVL from his barristers' chambers.

He was charged after police stopped him in Sydney International Airport and then searched his home in December 2019.

One admitted offence related to photographs of girls, aged as young as two years, in sexually suggestive poses while another concerned a data storage device found at his home that contained 1615 images of child abuse material.

Brierley rose to prominence in the 1970s with his eponymous company that, despite little starting capital, developed into an Australian-New Zealand conglomerate with investments in firms around the world.

It was at one time the largest company in NZ.

He was knighted in NZ in 1988, a year before standing down as head of Brierley Investments.

Brierley was a notable alumnus of Wellington College, where a theatre was named after him.

The school began scrubbing its grounds of his name after his guilty pleas on April 1.

Australian Associated Press